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Note 3 - Variable Interest Entities (Detail) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage | 50.00% |
Long-term Line of Credit, Noncurrent (in Dollars) | $ 24,012,000 |
Variable Interest Entity Income Percentage | 50.00% |
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Percentage | 50.00% |
Equity Method Investment, Ownership Percentage | 3.00% |
Number of Noncontrolling Owners |  | 1
Myers [Member] |  |
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage |  | 50.00%
Long-term Line of Credit, Noncurrent (in Dollars) | 3,000,000 |
Other Noncontrolling Interest Owners [Member] |  |
Secured Demand Notes (in Dollars) |  | 500,000

X
- Definition Number of Noncontrolling Owners + References No definition available. + Details
Name: | strl_NumberOfNoncontrollingOwners
Namespace Prefix: | strl_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The reporting entity's maximum amount of exposure (expressed as a percent) to loss as a result of its involvement with the Variable Interest Entity (VIE). + References No definition available. + Details
Name: | strl_VariableInterestEntityEntityMaximumLossExposurePercentage
Namespace Prefix: | strl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Variable Interest Entity Income Percentage + References No definition available. + Details
Name: | strl_VariableInterestEntityIncomePercentage
Namespace Prefix: | strl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition No authoritative reference available. + References No definition available. + Details
Name: | us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition No authoritative reference available. + References No definition available. + Details
Name: | us-gaap_LongTermLineOfCredit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition No authoritative reference available. + References No definition available. + Details
Name: | us-gaap_SecuredDemandNotes
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition No authoritative reference available. + References No definition available. + Details
Name: | us-gaap_VariableInterestEntityOwnershipPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration